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[RFCv2,07/16] x86/realmode: Share trampoline area if KVM memory protection enabled

Message ID 20201020061859.18385-8-kirill.shutemov@linux.intel.com (mailing list archive)
State New, archived
Headers show
Series KVM protected memory extension | expand

Commit Message

Kirill A. Shutemov Oct. 20, 2020, 6:18 a.m. UTC 
If KVM memory protection is active, the trampoline area will need to be
in shared memory.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 arch/x86/realmode/init.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
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Patch

diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
index 1ed1208931e0..7392940a7f96 100644
--- a/arch/x86/realmode/init.c
+++ b/arch/x86/realmode/init.c
@@ -9,6 +9,7 @@ 
 #include <asm/realmode.h>
 #include <asm/tlbflush.h>
 #include <asm/crash.h>
+#include <asm/kvm_para.h>
 
 struct real_mode_header *real_mode_header;
 u32 *trampoline_cr4_features;
@@ -55,11 +56,11 @@  static void __init setup_real_mode(void)
 	base = (unsigned char *)real_mode_header;
 
 	/*
-	 * If SME is active, the trampoline area will need to be in
-	 * decrypted memory in order to bring up other processors
+	 * If SME or KVM memory protection is active, the trampoline area will
+	 * need to be in decrypted memory in order to bring up other processors
 	 * successfully. This is not needed for SEV.
 	 */
-	if (sme_active())
+	if (sme_active() || kvm_mem_protected())
 		set_memory_decrypted((unsigned long)base, size >> PAGE_SHIFT);
 
 	memcpy(base, real_mode_blob, size);